OpenMP 测试程序

#include <omp.h>#include <stdio.h>int main(int argc, char * argv[]){int nthreads, tid, x;int nthrds = 4;x = 0;omp_set_num_threads(nthrds);#pragma omp parallel private(tid){tid = omp_get_thread_num();printf("Hello world from OMP thread %d/n",tid);}#pragma omp parallel shared(x){#pragma omp critialx = x + 1;}printf("x = %d /n", x);return 0;}

 

result:

[root@localhost ~]# gcc hello.c -o hello -fopenmp[root@localhost ~]# ./helloHello world from OMP thread 3Hello world from OMP thread 0Hello world from OMP thread 1Hello world from OMP thread 2x = 4 [root@localhost ~]#